Pencil sharpener



Sept. 28, 1937. E, MILLER 2,094,549

PENCIL SHARPENER Filed April 7, 1936 Patented Sept. 28, 1937 yf-uN rno STATES PENCIL SHARPENER Paul E. Miller, Dunbar, Pa.

The invention relates to electric pencil sharpeners and has for its object to provide adevice disposed for sharpening a pencilx" 'A'further object'is to provide a motor driven pencil sharpener and rotatably disposed cutter' rolls within thearmature of the motor, thereby allowingfa' relatively-compact power driven pencil sharpener to be='constructed.

r A further blciiect is to provide 'a' spiderwithin thecas'ing below thearmature and motor and sup & porting 'aniiit'ernal gear with'which gears carried by the cutter rollers Y I mesh whereby when the cutter roll cage is rotated by the motor arma turegthe"cutter rolls' will be simultaneously rotated for a pencil sharpening operation.

A further object is to provide a shield supported by the spider andfextending upwardly with the armature around the lower ends of the cutter rolls for preventing pencil shavings from passing into the motor between the armature and the field and upwardly into the chamber of the armature.

A further object is to support the armature on the cutter roll frame at its upper end.

With the above and other objects in view the Y invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawing:

Figure 1 is a side elevation of the pencil sharpening machine.

Figure 2 is a top plan view.

Figure 3 is a vertical longitudinal sectional view through the machine. 7

Figure 4 is a horizontal sectional view taken on line 4-4 of Figure 3.

Figure 5 is a detail sectional view taken on line 5-5 of Figure 2.

Figure 6 is a bottom plan view of the top plate of the casing.

Referring to the drawing; the numeral l designates the cylinder of the machine and disposed within the cylinder l are field coils 2 forming a conventional form of motor field. Rotatably mounted within the field between the field coils 2 is a motor armature 3 having a chamber 4 therein. The upper end of the armature 3 is provided with a plate 5, which is secured to the upper side Lenses rarest or ies A plication'Anril 7, 1936, .Sgrml 73174 4 claim (01. 2F

of the cutter roll frame 6 by means of screws so that the cutter roll framewill rotate with the armature 3 as it rapidly rotates within the motor field. The frame 6, at opposite sides thereof, is provided with downwardly extending arms l, which are preferably formed integral with the plate 8,-which is in turn rotatably mounted in a bearing 9 of the-supporting boss it carried by the radial spider arms ll. Plate 8' is also antifrictionally supported on a beari ng l2 so that the friction is'reduced to aminimum. Boss i0 is provided with an internal gear I 3, with which the gears carried by the lower ends of "the cutter rollers l5 mesh. and as the boss I9 is stationary it will be seen that as the armature 3- rotates, carrying the'roller-frame 6; the rollers will-be rapidly rotated on their bearing pintles M;

1It-wil1 be noted that the armature 3 and the cutter frame and cutter rolls are entirely dis-' posed within the armature, therefore it will be seen that a relatively low compact machine and structure is provided, which will materially reduce the height of the machine.

The spider arms I I are carried by an annular member 15, removably secured by means of screws I6 in the lower end of the cylinder I, and disposed beneath the spider is a removable drawer l7, into which will fall, by gravity, pencil shavings as they are cut from a pencil vertically disposed within the machine.

To prevent shavings from accumulating between the armature 3 and the field and field coils, a shield 18 is provided, which shield is secured to the upper side of the annular member l5 at the outer ends of the arms I! and extends upwardly towards the armature 3 and terminates in a horizontally disposed flange I9,'which in turn terminates in an upwardly extending cylindrical portion 20 having a downwardly and inwardly extending flange 2! at its upper end and disposed above the pencil cutting portions of the rollers l 5. It will be seen that the shield l8 will prevent the shavings from getting between the armature and field and the'fiange 2i will form means for stopping the upward movement of any of the shavings which may be accidentally sucked upwardly.

The upper end of the cutter roll frame 6 is provided with a hollow boss 22, which is rotatably mounted in a bearing 23 of a boss 24 carried by the removable cover 25 of the casing, and extending radially into the chamber 26 of the boss 24 is a spring pressed pencil engaging member 21, which when forced outwardly against its spring action, forces its outerv arm 28 into engagement with spaced contacts 29, thereby closing a conventional circuit 30 to the motor fields.

When a pencil is removed from the machine the pencil engaging member 21 moves inwardly under the influence of its spring means thereby breaking the contact at 29 and stopping the motor. It will be seen that the operation of the device is automatic.

Secured to the upper side of the cover plate 25 is an apertured member 3|, the aperture 32 of which registers with the apertures 26 and pas sage through the member 22, all of which are on the axis of the machine. The aperture 32 is large enough to receive the maximum size pencil, however as pencils vary in diameter it has been found desirable to provide means for receiving pencils of different diameter and preventing excessive lateral movement of the pencil during the sharpening operation. To accomplish this result an apertured disc 33 is pivotally mounted at 33 on the apertured member 3| and is provided with concentrically arranged apertures 35, which are concentric to the axis of pivot 34, therefore it will be seen that various size apertures can be placed in axial relation to the pencil receiving aperture of the machine. The apertured disc 33 is held in various adjusted positions by means of a spring detent 36, as shown in Figure 5, and which is received in apertures 31 in the under side of the disc 33.

From the above it will be seen that a power pencil sharpener is provided which is simple in construction, the parts reduced to a minimum, and one wherein the motor will not become clogged with shavings and the cutter rolls disposed Within the motor armature, thereby allowing and providing a compact structure.

The invention having been set forth what is claimed as new and useful is:

1. The combination with an electric pencil sharpener comprising a casing, a motor field within the casing, a rotatable armature within the field, rotatable cutter rolls within the armature, of means for preventing shavings from pencils from passing between the field and armature at the lower and upper ends thereof.

2. A device as set forth in claim 1 wherein the shield means comprises a supporting spider beneath the field and armature, a wall carried by said spider and extending upwardly to a position below the armature and thence upwardly around the cutter rolls within the lower end of the armature.

3. A device as set forth in claim 1 comprising a shaving shield extending upwardly from below the armature and into the armature around the lower ends of the cutter rolls and a wall carried by the upper end of the armature and attached to the upper end of the cutter roll frame and forming a closure for the upper end of the armathe lower ends of the field and armature and forming means whereby pencil shavings are prevented from passing between the field and armature.

PAUL E. MILLER. 

